Controller-less WLANs

What is the best way to check the CPU utilization and Free memory on Instant AP's?
Q:

What is the best way to check the CPU utilization and Free memory on Instant AP's? 



A:

"show cpu" and "show cpu details" are the commands mostly used to check the cpu usage and memory usage on IAPs. However, the value we see here are specific to the time at which we run the command. 

The best command to check the cpu and memory usage on IAPs is "show stats ap <AP-IP-ADDRESS>". IAP samples the cpu and memory usage every 30 seconds and it can be seen in this output. This output prints the cpu utilization and and available free memory information taken during the past five minutes that would be helpful to understand if the IAP was running on a high CPU / Memory utilization for a long time. 

Below are example outputs of "show cpu", "show cpu details" and "show stats ap <AP-IP-ADDRESS>" 

Rajaguru-IAP-205H# show cpu

 total: user   8% nice   2% system   2% idle  82% io   0% irq   0% softirq   6%
 
 
Rajaguru-IAP-205H# show cpu details

Mem: 123420K used, 132244K free, 0K shrd, 0K buff, 26444K cached
Load average: 1.11 1.23 0.70  (Status: S=sleeping R=running, W=waiting)
  PID USER     STATUS   RSS  PPID %CPU %MEM COMMAND
 1650 root     R N     5448  1573  9.1  2.1 sapd
 3436 root     R        360  2713  3.4  0.1 top
 2165 root     S <    33876  1640  1.1 13.2 dpimgr
 1640 root     S <    12204  1573  0.0  4.7 cli
 2713 root     S       2928  2705  0.0  1.1 cli
 1654 root     S <     2532  1573  0.0  0.9 stm
 1660 root     S <     2348  1573  0.0  0.9 snmpd_sap
 1663 root     S <     2324  1573  0.0  0.9 mdns
 2650 root     S <     1956  1640  0.0  0.7 rapper
 2540 root     S <     1908  1573  0.0  0.7 radiusd-term
 2539 root     S <     1872  1573  0.0  0.7 radiusd
 1669 root     S <     1420  1573  0.0  0.5 meshd
 1666 root     S <     1336  1573  0.0  0.5 lldpd
 1582 root     S       1220  1573  0.0  0.4 tinyproxy
 1639 root     S N     1220  1573  0.0  0.4 awc
 1573 root     S <     1132     1  0.0  0.4 nanny
 1667 root     S <     1036  1573  0.0  0.4 rfd
 1477 root     S <      740     1  0.0  0.2 mini_httpd
 1480 root     S <      728     1  0.0  0.2 mini_httpd
 1629 root     S <      724  1573  0.0  0.2 syslogd
 1474 root     S <      708     1  0.0  0.2 mini_httpd

Rajaguru-IAP-205H# show stats ap 10.17.170.16

Util Level:good
Noise Level:good
Error Level:good
2.4 GHz Channel:11
5.0 GHz Channel:116E
Usage
-----
Timestamp  CPU Utilization (%)  Memory Free (MB)  Neighboring APs [Valid]  Neighboring APs [Interfering]  Neighboring APs [Rogue]  Neighboring Clients [Valid]  Neighboring Clients [Interfering]  Clients  Throughput [Out] (bps)  Throughput [In] (bps)
---------  -------------------  ----------------  -----------------------  -----------------------------  -----------------------  ---------------------------  ---------------------------------  -------  ----------------------  ---------------------
10:15:30   7                    44                8                        242                            0                        0                            1                                  0        0                       0
10:15:01   8                    44                8                        242                            0                        0                            1                                  0        0                       0
10:14:30   7                    44                8                        242                            0                        0                            1                                  0        0                       124
10:14:00   7                    44                8                        242                            0                        0                            1                                  0        0                       307
10:13:30   7                    44                8                        242                            0                        0                            1                                  0        0                       0
10:13:01   7                    44                8                        242                            0                        0                            1                                  0        0                       80
10:12:30   7                    44                8                        242                            0                        0                            1                                  0        0                       60
10:11:59   7                    44                8                        242                            0                        0                            1                                  0        0                       42
10:11:30   7                    44                8                        242                            0                        0                            1                                  0        0                       26
10:10:59   6                    44                8                        242                            0                        0                            1                                  0        0                       104
10:10:29   7                    44                8                        242                            0                        0                            1                                  0        0                       27
10:10:00   8                    44                8                        242                            0                        0                            1                                  0        0                       0
10:09:31   7                    44                8                        242                            0                        0                            1                                  0        0                       2798
10:09:00   8                    44                8                        242                            0                        0                            1                                  0        0                       6479
RF Trends
---------
Timestamp  Utilization [2.4 GHz] (%)  Utilization [5.0 GHz] (%)  Noise Floor [2.4 GHz] (dBm)  Noise Floor [5.0 GHz] (dBm)  2.4 GHz Frames [Errors] (fps)  5.0 GHz Frames [Errors] (fps)  2.4 GHz Frames [Out] (fps)  5.0 GHz Frames [Out] (fps)  2.4 GHz Frames [In] (fps)  5.0 GHz Frames [In] (fps)  2.4 GHz Frames [Drops] (fps)  5.0 GHz Frames [Drops] (fps)  2.4 GHz Mgmt Frames [In] (fps)  5.0 GHz Mgmt Frames [In] (fps)  2.4 GHz Mgmt Frames [Out] (fps)  5.0 GHz Mgmt Frames [Out] (fps)
---------  -------------------------  -------------------------  ---------------------------  ---------------------------  -----------------------------  -----------------------------  --------------------------  --------------------------  -------------------------  -------------------------  ----------------------------  ----------------------------  ------------------------------  ------------------------------  -------------------------------  -------------------------------
10:15:30   49                         2                          -97                          -97                          889                            12                             38                          39                          1111                       48                         0                             0                             219                             41                              0                                1
10:15:01   48                         2                          -97                          -97                          859                            8                              38                          39                          1084                       47                         0                             0                             222                             35                              0                                1
10:14:30   52                         3                          -97                          -97                          821                            8                              38                          40                          1057                       42                         0                             0                             234                             42                              0                                2
10:14:00   46                         3                          -97                          -97                          902                            7                              38                          39                          1141                       60                         0                             0                             236                             44                              0                                1
10:13:30   48                         3                          -95                          -97                          946                            8                              38                          39                          1186                       61                         0                             0                             237                             43                              0                                0
10:13:01   48                         3                          -97                          -97                          746                            9                              39                          39                          966                        61                         0                             0                             217                             45                              0                                1
10:12:30   41                         3                          -97                          -97                          583                            5                              39                          41                          802                        57                         0                             0                             216                             45                              0                                1
10:11:59   39                         3                          -97                          -97                          486                            11                             38                          39                          688                        56                         0                             0                             200                             36                              0                                1
10:11:30   39                         2                          -97                          -97                          719                            7                              39                          40                          926                        45                         0                             0                             203                             32                              0                                1
10:10:59   41                         2                          -97                          -97                          786                            13                             38                          39                          994                        51                         0                             0                             206                             32                              0                                0
10:10:29   44                         2                          -97                          -97                          1036                           10                             38                          21                          1252                       42                         0                             0                             213                             31                              0                                1
10:10:00   45                         1                          -97                          -97                          861                            8                              37                          0                           1053                       46                         0                             0                             190                             32                              0                                0
10:09:31   45                         1                          -97                          -97                          876                            34                             39                          17                          1072                       153                        0                             0                             193                             100                             0                                0
10:09:00   45                         10                         -97                          -97                          678                            52                             39                          39                          887                        264                        0                             0                             206                             180                             0                                0
Client Heatmap
--------------
Clients  Signal  Speed  IP Address
-------  ------  -----  ----------
AP List
-------
Name               IP Address    Mode    Spectrum  Clients  Type  Zone  Serial #   CPU Utilization %:  Memory Free (MB):  Need Antenna Config  From Port  Config Id  Config Csum  MAC
----               ----------    ----    --------  -------  ----  ----  --------   ------------------  -----------------  -------------------  ---------  ---------  -----------  ---
Rajaguru-IAP-205H  10.17.170.16  access  disable   0        205H  -     DN0042302  7                   44                 No                   none       0          35045        00:0b:86:f5:d0:8a 
Version History
Revision #:
2 of 2
Last update:
‎03-29-2017 12:08 PM
Updated by:
 
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